Update github-action.yml

.github/workflows/github-action.yml

@@ -60,7 +60,7 @@ jobs:
         with:
           host: ${{ secrets.HOST}} # EC2 퍼블릭 IPv4 DNS
           username: ${{ secrets.USERNAME }}
-          key: ${{ secrets.PRIVATE_KEY }}
+          key: ${{ secrets.PRIVATE_KEY }} # private key test
           script: |
             sudo docker ps
             sudo docker pull ${{ secrets.DOCKER_USERNAME }}/kimgreen